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Efficiency


Measure of how much of the input energy is converted into
useful output energy
, rather than being
wasted
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Calculating efficiency


1. In terms of energy: Efficiency =
useful output energy transfer
/
total input energy transfer
2. In terms of power: Efficiency =
useful power output
/
total power input
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To make energy transfers more efficient, we have to maximise the
useful energy
and minimise the
wasted energy
from a transfer
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100%
efficiency is usually
impossible
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There is usually always some wasted heat energy in the form of
heat
/
thermal
energy
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Sometimes the definition of 'useful' energy can change - e.g. some lights are designed to provide
heat
and light, so the
heat
energy is also useful
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Efficiency


Useful output energy transfer /
total input
energy transfer
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Power


Measured in
watts
,
W
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We can increase efficiency in several ways:
thermal insulation
,
lubrication
and streamlining
View source
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